Testing of Woven Wire Cloth according to ISO 9044

Determination of the wire diameter The wire diameter after weaving may be determined by using one of the following procedures:1.)by measuring wires which have been loosened fromthe woven wire cloth (e.g. by using a micrometer screw),2.)by measuring the wires in the cloth, if there is suffi-cient space for the measuring instrument.The tolerance of the wire before weaving can no longerbe determined in the woven wire cloth, because of its heavy deformation during weaving. The nominal wire diameter, however, can be calculated using the empirical weight formula. Aperture width (Measuring row method) In this simplified method, the number of pitches (p) in a given length (L) is determined. The given length is then divided by the number of pitches to give the average pitch. Subtraction of the wire diameter (d) from the average pitch then gives the aperture width (w).Todetermine the arithmetical mean value of the aperturewidths, as many pitches have to be measured as are nec- essary to obtain a representative value.When measuring aperture widths between 16 and 1 mm10 pitches have to be checked; smaller aperture widths – up to 0.1 mm – should be checked within 20 pitches.
Micrometer screw to determine the wire diameter Calliper (vernier) for measuring aperture widths of more than 4 mm; itmay be used for aperture widths of more than 10 mm, too. wp dw p Counting glass for measuring aperture widths less than 1 mm in a mea-suring row with determined length dw L Measuring row with determined length for aperture widths of 1 up to 16 mm

Required Details forWire Cloth Orders

1.Quantity: number of pieces or rolls2.Dimensions: length and width or rolls 3.Material 4.Aperture width: wMesh count (per linear inch)or number of meshes per cm
2 may likewise be stated instead of the aperturewidth.5.Wire diameter: d6.Type of weave – if necessary 7.Post weaving processing – if desired 08.Shaped parts or filters:provide samples, sketches ordrawings, preferably with permissible tolerances.09.Samples: should you have a sample of the wire clothused previously, kindly send it to us. We shall then analyze the specification.10.Repeat orders: so as to furnish you with the correctmaterial either let us have a roll-label or provide the exact technical data of the previous order. 3